astro (version 1.2)

lookback2z: Redshift at a given Lookback Time

Description

Calculates the lookback time (light travel time)

Usage

lookback2z(t = 1, steps = 10, H = 70, M = 0.3, L = 1-M, K = 1-M-L,  units = "Gyr")

Arguments

t

time

steps

number of accuracy steps

H

Hubble constant (km/s/Mpc)

M

Omega M - matter

L

Omega L - energy

K

Omega K - curvature

units

input units [Gyr/s]

Value

Redshift at a given lookback time with the given cosmology.

Details

This is a very crude inverse variation of the 'lookback' function. As such, the output result should be used as a guide only.

References

Hogg D. W., 1999, ArXiv Astrophysics e-prints, arXiv:astro-ph/9905116

See Also

The astronomy package: astro.